By-pass gate valve



Nov. 28, 1933. w, N, L 1,936,873

BY-PASS GATE VALVE Filed Dec. 22, 1930 20 I v Z3 Z6 25 2% a7 L I I V. 21

F W zm/zmzz 674 a Patented Nov. 28, 1933 .UNI- S ATES e T 1,936,813 vBY-PASS GA'rn VALVE William N. Glab, Dubuque, Iowa, assi g'nor toMorrison Bros., Dubuque; Iowa; a corporation Appl cation December 22,1930 Seria1"No.5Q3;958

v This invention relates in general to a valve,

and is more particularly concerned with improved means for by-passin'gthe valve.

. Heretofore in installing a gate valve having a by-pass for relievingthe supply pipe of excessive pressure, it has been necessary toconnectthe supply pipe to the pipe connectioin of the valve incommunication-with the inlet side of the bypass means .in order torender the by-pass valve operative. This arrangement is not foolprooffor the reason that an. installer is quite :apt' to install the valveina reverse position,,thereby disposing the by-passmeans on the outletside of the gate valve and rendering it ineffective to i relieve thesupply line of excessive pressure;

It is a primary object of this invention to provide a gate valvehavingby-pass means which is operative regardless of which of thegtwopipe connections of the gate valve is connected to the inlet or-supplypipe. the valve thereby beingfoolprooff andalways correctly installed.

It is a further object of this invention to provide improved means foroperating ,the' main valve memberof a gate valve of the like.

Otherand further important objects of this inventionwill be apparentfrom the disclosures in the a\"Jwmpwying d awing. and the followingspecification. v

The invention iina preferred form) illus-- trated on the drawing andhereinafter more fully described, 7 .Y I On the drawing?" 7 Figure 1 isavertical sectional view partly in elevation, taken substantially on thecenter line tofthe valve; Figure 2 is a horizontal sectional view takenthrough thevalvemasing on "substantially line 11-11 of Figure" "1-,showing the by-pass mechanism. t i

.Figure 3' is an enlarged fragmentary-view showing the details of-meansfor securing the valve cap to the casing;

,As shown on the drawing: 7 I

In the illustrated .''embodiment of my invention, there is shown Figure'1 agate valve comprising'a casingl having an inlet opening 2 and anoutlet opening 3. Since these openings are similar in-construction;either 'onemay he used as an outlet or inlet withoutaffecting theoperation of the" by-pass mechanism. These openings are internallyth'readed'as at: 4 to fa cilitate the "connection of pipesthereto.

'Ihe openings '2 and 3 communicate witha main valve chamber 5 andupwardly and outwardlyinclined valve seats ligand? are provided,

at the respective oi ch-ambe nd the inlet and'outlet onemnza the;-va.lve "seats being spaced apart'to receive therebetween valvemembersB and 9. The lateral marginsMit-he v valve members extendaintoguidewaysi 10 formed in the casing l', which permitthe valve members tobe slidably moved relativeto thevalve seats. Also the valve members areprovided with lateral lugs 10" -(Figure;:2) for aiding in the guidingofthesemembers' to theirseats.

The confronting surfaceszof the valve members 8 and 9 each haveaprojecting portion 11 which is formed intermediate the top andbottomthereof, 81111113812, recessed portion for engagement with the:lower .end 12 of a valve stem-l3; the endzl2 being'bev'eledtoform'a'conical wedge, The up- 9 16 and 17; A collar 18 is secured to thevalve stem 13 and pr'ojectsintothesegrooves for engagement with thelower surfaces of the projecting portions f' 14 and 15 when the valve isactuated by manipu latinga hand wheel 19 at the upper end] thereof;

for receiving the lower edge-'of'='a;cap 21 which surrounds andthreadedly engages the valve stem 13; The cap 21 is secured to thecasing 1 by means of a plurality of peripheral lugs, one of which isshown at 20',' in Figure 3; which cooperate with similarly spacedlug's21"-on the casing, 'aholding end of a coil spring 25 whichsurroundsthe collar. A-sleeve 26 surrounds andslidably engages thecollar 23 for relative axialmovernent- TI'he lower edg'eof the sleeve'26is'deflected outwardly to form an annular flange" 27 againstwhich thelower end of the spring 25 engages. Whenth'e valve members are moved'to'the seating position, asjshown in'Figure 1, further operation. of thehandle 19 will move I I v out of engagement with the projecting portions14- and 15 andslmultaneouslytherewith-pause the the collar ltldownwardly1 .105" r conical end 12 of the'valve stem to'actas awedge between theprojecting portionsl1,-the,valve members being therebyiorce'd outwardlyagainst 7 1 theresp ctive valveseats; 1

Thecasingl isprovidedlwitha'seat portion flo It will be observed thatwith the arrangement 8 and 9 will be forced downwardly untiltheprojecting portions 14 and 15 engage the collar 18, the members beingheld'in thisposition dueto the influence of the spring 25. Inthisposition, it will be observed, the conical end 12 of the stem 13will be disengaged from the projecting ortions 11; thereby permittingthe lower ends of the valve members to be moved-towards each other bythe pressure of spring 25, a fulcrum beingformed at the points ofengagement between the projecting portions 14 and 15 andthe;-collar}l8., This action of the spring greatly facilitates theunseating of valve members 8 and 9. I

A side of the casing 1 extends outwardly to form an annular flange 28having its inner surface having a central cavity or socket 30 whichopens into thelower face "thereof. That portion of the casing which isadjacent theopen end of the socket-30=is countersunk to provide aconical depr'ession 31'which forms a'seat for an auxiliary valve 32.'Ihe auxiliary; valve seat is drilled at its center to form a socket 33forreceiving' therein a valve stem 34 which serves to guide themovementof the valve. The upper end of the valve 32 is reducedto form anannular 'fiange constituting a seat for the lower end of a compressionspring 35 whichextendsfbetween the valve and theiupper end of the socket30 for holding the valve in seated position. Cored passageways 36 and37are tions so that in installing the valve either one of said connectionsmay be connected to an inlet pipe without rendering the by-pass meansin-- operative.

2. In a valve, a casing defining a main valve chamber, .an inletconnection and an outlet connection, passageways in communication withsaid inlet and outlet connections, and a single auxilia'ryTvalve forinterconnecting said passageways v upon the occurrence of abnormalpressure in either one of said connections to by-pass fluid around saidmain valve chamber.

3. In a;valve,.a, casing defining a main valve ,chamberand v an,auxiliary valve chamber, an

inlet and an, outlet, passageways in the casing connecting the auxiliaryvalve chamber with the inlet 'and outlet, and a single valve in theauxil- V iary "valve chamber for normally closing and threaded forreceiving a screw plug 291(Figure 2)? formed inthe casing l,which-extend obliquely.

from. the respective inlet and outlet openings of the valveand-terminate in the conical surface '31 which forms the seat for theauxiliary valve. will be observed that'the auxiliary valve of myinvention .w111' automatically operate 5 to connect the passageways 36and 37, whenthe pressure in either of the pipe connections 4 of the gatevalve becomes abnormal, depending upon which .of the connections is usedas an inlet, thereby relieving the'pressure and preventing the burstingof pipes,

the blowing out of gaskets, and-other damage normal pressure ofthe'fluid in either ofthe conwhich might otherwise? followtheaoccurrenceof a'nabnormal pressure. 1 Furthermore, theby-pass meansis :operative irrespective ofwhich of the. two pipe connections 4 of thegate valve is connected to the inlet or sup-'- ply pipe, the gate valvethereby being reversible,

in position when being installed without changing or eifectingtheoperation'of the .by-pass means. As soon as the abnormal pressureis're-' lieved, the auxiliary valve will automatically close. The valveof my invention therefore prov-ides improved means for. actuating themainvalve memberszto open and closed positions,.:'andalso a novelauxiliaryvalvefor automatically estab lishing'a by-pass around the mainvalve upon the covering the associated ends of both of said pas saidpassageways in the auxiliary valve chamber and means fornormally.maintainingisaid valve in closed position.:-" V 1 v 5.-In agate 'valveincluding acasing having inletand outlet connections throughwhich fluid is adapted to flow in only a single direction, andllqmainfvalve meansbetween'sa'id connections and movableginto and out ofthe path of the fluid. flowing through the valve, 'fluid by-passingmeansbetween said connections including. auxili ary valve means operable inresponse'to'an abnections, depending upon which of'the connections v isused as aninlet,--for by-passing'the'fiuid around said main valve means.

and outlet connections. through. which -fiuid' 'is adapted :to:fiow' inonly a single direction 'when the valve is in use, and valve meansbetween said v shutting oiT the fiowof fluidins'aid passage, and

' fluid in either of the connections for "allowing the;

occurrence of abnormalpressure mom of the.

l ipe.connectionsjof-the.valve. I .I. am. aware that numerousdetails'.of; construction'may bewaried-through a wide rangewithoutldeparting from the spiritof thiskinven- 'tion,'.and-I-Itherefore do not purpose limiting; the

patent: granted otherwise I than s; necessitated bythe stateofthepriorart.

clainrasmyyinventionz 1...Inv :ayalve having inletland outlet connecasingle direction, by pass-means. actuable in "re-.

sponseto anabnormal pressure in either one. of

seated :in' a closed position'in'such a manner as to be sensitive tothe-pressure of fluid'in either of said connections and movableto an;open *p'osition in response toan abnormal pressure-ofthe fluid to be"b'y-passed "through" said passageways.

7. In a valve includinga' casing having inlet I andoutletconnections,and valv'e'm'eans between said connections, fluid bypassing means'comprising a valve member having a conical seating 1surface, a conical seatiorsaid valve member, and p'assagewaysextending'ifrom'xsaid "connections andterminatirig in said valve seatfor sub;jectingthe=conical seatingsurface of the valve member to the pressure ofthe fluid in said" con-- nections whereby upon thefiuid pressure ineither i of said connections; exceeding Z-a predetermined amountsaidvalvemember will be moved off: of itsv seat,.to-open.position togallowfiuidjto. flow around saidjvalve, means from one connection to said'connectionsv for. establishing an: auxiliary tlieiotherthrough saidpassageways. j z In-.-a valve including a casinghavinginletand outletconnectionaandvalve means between r 6.1n a valve including acasinghaving inlet 120 said connections, fluid by-passing meanscomprising a valve member having a conical seatin surface, a conicalseat for said valve member, and passageways from said connectionsterminating in the valve seat, the axes of the passageways [adjacentsaid seat being-substantially at right angles to the seating surface ofthe valve, whereby an increase of fluid pressure in either of. saidconnections above a predetermined amount. will actuate the valve to openposition and interconnect thepassageways.

N. GLAB.

